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'is BA159GP as good as 1N4007?'
Author:Luke Duke (registered user: 352 posts )
Date: Thu, Sep 04th, 2008 @ 21:02 ( . )

I got a bum load of BA159GP recto's and I wonder if they will do the same job as 1n4007's? I think one threashold voltage might be lower, but it looks the same over all... Anyone used these before? Anything to worry about, or just use 'em like 1N4007's?

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'is BA159GP as good as 1N4007?'
Author:AletheianAlex (registered user: 3532 posts )
Date: Thu, Sep 04th, 2008 @ 21:43 ( . )

I have never used them, but I just checked the data sheet and they look much better than 1n4007 actually.

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'is BA159GP as good as 1N4007?'
Author:spud (registered user: 3322 posts )
Date: Fri, Sep 05th, 2008 @ 01:09 ( . )

The main diff is the recovery time - 500ns (Ba159GP) vs 2000ns (1n4007). At least according to the datasheets I saw at:

[link]

If you want really fast, try the UF series. I used UF5408 in my HO and will try some UF4007 in my firefly. In the new P1/P1EX/HO/SEL plans, they all call for the UF series (UF4007). The UF5408's (3A) are also very similar to the 1N4007 and BA159's except the switching time is like 75ns instead of 500ns or 2000ns (which is really 2ms - milli-seconds!!!). I'm sure the BA159s will reduce PS buzz and hum but maybe not to the degree of the UF's. There are other Ultra Fast Recovery diodes that have similar voltage and current specs - the HER108 is one and there are others I found at Mouser, just don't remember the names.

spud

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'is BA159GP as good as 1N4007?'
Author:Derek H (registered user: 105 posts )
Date: Fri, Sep 05th, 2008 @ 01:39 ( . )

To jump on the diode wagon here... is there a problem using the UF5408 3amp diodes vs the 1N4007? I have a dozen and may be building a SS rectifier amp soon. The leads are monsters, look like 10 amp capable rods that will require a pipe bender to radius :)

Is there any downside to them outside of overkill?
.... Can I paint them with C47 and bring out the true silence in the sound? *g*

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'is BA159GP as good as 1N4007?'
Author:John Hynes (registered user: 2592 posts )
Date: Fri, Sep 05th, 2008 @ 05:45 ( . )

No, they're fine to use. Go for it.

-John

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'is BA159GP as good as 1N4007?'
Author:spud (registered user: 3322 posts )
Date: Fri, Sep 05th, 2008 @ 09:01 ( . )

Big and beefy - they worked great in my HO. I wish that Duncan's PS modeling tool had a way to support them. I'm not sure how to create a new diode definition. I think it's in the data file he uses but I don't see any way to spec the recovery time - it's probably there, I just don't see it. I'm sure if they could be used and defined properly, the voltage fluctuation/variations you see now at B+ and B+1 (esp at startup) for almost all PSes would be significantly reduced. I made one for HO PS and the Firefly using the 1N4007 - didn't try the BA159GP's. Not sure they are defined in the data file at all.

spud

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'is BA159GP as good as 1N4007?'
Author:spud (registered user: 3322 posts )
Date: Fri, Sep 05th, 2008 @ 09:20 ( . )

Just looked at the data file - it has no way to spec the recovery time so do you think it assumes 2000ns (2ms) for all? Would dropping that reduce the variations of V(C1) - on my firefly model it runs about 1.2v

spud


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'is BA159GP as good as 1N4007?'
Author:spud (registered user: 3322 posts )
Date: Fri, Sep 05th, 2008 @ 09:48 ( . )

From looking at the Duncan PSU tool again, I don't see how the recovery time would affect it since it's really driven by the 60 cycle AC rise and fall and once full wave rectified, 120 hz peaks at C1. Ripple past that is really a function of the caps - maybe higher value C1? Guess I need to study more about PSU design parameters. Duncans tool is great though, top notch.

spud

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